diff options
Diffstat (limited to '')
| -rw-r--r-- | synapse/handlers/search.py | 19 | ||||
| -rw-r--r-- | synapse/storage/search.py | 123 |
2 files changed, 120 insertions, 22 deletions
diff --git a/synapse/handlers/search.py b/synapse/handlers/search.py index 50688e51a8..6d2197339e 100644 --- a/synapse/handlers/search.py +++ b/synapse/handlers/search.py @@ -139,11 +139,18 @@ class SearchHandler(BaseHandler): # Holds the next_batch for the entire result set if one of those exists global_next_batch = None + highlights = set() + if order_by == "rank": - results = yield self.store.search_msgs( + search_result = yield self.store.search_msgs( room_ids, search_term, keys ) + if search_result["highlights"]: + highlights.update(search_result["highlights"]) + + results = search_result["results"] + results_map = {r["event"].event_id: r for r in results} rank_map.update({r["event"].event_id: r["rank"] for r in results}) @@ -187,11 +194,16 @@ class SearchHandler(BaseHandler): # But only go around 5 times since otherwise synapse will be sad. while len(room_events) < search_filter.limit() and i < 5: i += 1 - results = yield self.store.search_room( + search_result = yield self.store.search_room( room_id, search_term, keys, search_filter.limit() * 2, pagination_token=pagination_token, ) + if search_result["highlights"]: + highlights.update(search_result["highlights"]) + + results = search_result["results"] + results_map = {r["event"].event_id: r for r in results} rank_map.update({r["event"].event_id: r["rank"] for r in results}) @@ -347,7 +359,8 @@ class SearchHandler(BaseHandler): rooms_cat_res = { "results": results, - "count": len(results) + "count": len(results), + "highlights": list(highlights), } if state_results: diff --git a/synapse/storage/search.py b/synapse/storage/search.py index 380270b009..c6386642df 100644 --- a/synapse/storage/search.py +++ b/synapse/storage/search.py @@ -20,6 +20,7 @@ from synapse.api.errors import SynapseError from synapse.storage.engines import PostgresEngine, Sqlite3Engine import logging +import re logger = logging.getLogger(__name__) @@ -194,14 +195,21 @@ class SearchStore(BackgroundUpdateStore): for ev in events } - defer.returnValue([ - { - "event": event_map[r["event_id"]], - "rank": r["rank"], - } - for r in results - if r["event_id"] in event_map - ]) + highlights = None + if isinstance(self.database_engine, PostgresEngine): + highlights = yield self._find_highlights_in_postgres(search_term, events) + + defer.returnValue({ + "results": [ + { + "event": event_map[r["event_id"]], + "rank": r["rank"], + } + for r in results + if r["event_id"] in event_map + ], + "highlights": highlights, + }) @defer.inlineCallbacks def search_room(self, room_id, search_term, keys, limit, pagination_token=None): @@ -294,14 +302,91 @@ class SearchStore(BackgroundUpdateStore): for ev in events } - defer.returnValue([ - { - "event": event_map[r["event_id"]], - "rank": r["rank"], - "pagination_token": "%s,%s" % ( - r["topological_ordering"], r["stream_ordering"] - ), - } - for r in results - if r["event_id"] in event_map - ]) + highlights = None + if isinstance(self.database_engine, PostgresEngine): + highlights = yield self._find_highlights_in_postgres(search_term, events) + + defer.returnValue({ + "results": [ + { + "event": event_map[r["event_id"]], + "rank": r["rank"], + "pagination_token": "%s,%s" % ( + r["topological_ordering"], r["stream_ordering"] + ), + } + for r in results + if r["event_id"] in event_map + ], + "highlights": highlights, + }) + + def _find_highlights_in_postgres(self, search_term, events): + """Given a list of events and a search term, return a list of words + that match from the content of the event. + + This is used to give a list of words that clients can match against to + highlight the matching parts. + + Args: + search_term (str) + events (list): A list of events + + Returns: + deferred : A set of strings. + """ + def f(txn): + highlight_words = set() + for event in events: + # As a hack we simply join values of all possible keys. This is + # fine since we're only using them to find possible highlights. + values = [] + for key in ("body", "name", "topic"): + v = event.content.get(key, None) + if v: + values.append(v) + + if not values: + continue + + value = " ".join(values) + + # We need to find some values for StartSel and StopSel that + # aren't in the value so that we can pick results out. + start_sel = "<" + stop_sel = ">" + + while start_sel in value: + start_sel += "<" + while stop_sel in value: + stop_sel += ">" + + query = "SELECT ts_headline(?, plainto_tsquery('english', ?), %s)" % ( + _to_postgres_options({ + "StartSel": start_sel, + "StopSel": stop_sel, + "MaxFragments": "50", + }) + ) + txn.execute(query, (value, search_term,)) + headline, = txn.fetchall()[0] + + # Now we need to pick the possible highlights out of the haedline + # result. + matcher_regex = "%s(.*?)%s" % ( + re.escape(start_sel), + re.escape(stop_sel), + ) + + res = re.findall(matcher_regex, headline) + highlight_words.update([r.lower() for r in res]) + + return highlight_words + + return self.runInteraction("_find_highlights", f) + + +def _to_postgres_options(options_dict): + return "'%s'" % ( + ",".join("%s=%s" % (k, v) for k, v in options_dict.items()), + ) |